Overview
The NCP308MT300TBG is a supervisory circuit IC from onsemi, designed to monitor system voltages and provide a reset signal when the voltage drops below a specified threshold. This device is part of the NCP308 series, which is optimized for low quiescent current and programmable delay times. It supports a wide supply voltage range from 1.6 V to 5.5 V and features both fixed and externally adjustable threshold voltage versions.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage Range (VDD) | −40°C < TJ < +125°C | 1.6 | 5.5 | V | |
| Minimum VDD Guaranteed RESET Output Valid | 0.5 | 0.8 | V | ||
| Supply Current (IDD) | VDD = 3.3V, RESET not asserted, MR, RESET, CT open | 1.6 | 5.0 | μA | |
| Low-level output voltage of RESET (VOL) | 1.3V ≤ VDD < 1.6V, IOL = 0.4 mA | V | |||
| Reset Delay Time (tD) | CT = Open | 20 | ms | ||
| Reset Delay Time (tD) | CT = VDD | 300 | ms | ||
| Reset Delay Time (tD) | CT = 100 pF | 1.25 | ms | ||
| Propagation Delay from MR to RESET (tP1) | VIH = 0.7 VDD, VIL = 0.3 VDD | 150 | ns | ||
| Propagation Delay from SENSE to RESET (tP2) | VIH = 1.05 VIT, VIL = 0.95 VIT | 20 | μs | ||
| Threshold Voltage (VIT) | 2.79 | 3.07 | V |
Key Features
- Wide Supply Voltage Range: 1.6 V to 5.5 V
- Very Low Quiescent Current: 1.6 μA
- Fixed Threshold Voltage Versions for Standard Voltage Rails: 0.9 V, 1.2 V, 1.25 V, 1.5 V, 1.8 V, 1.9 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V, 5.0 V
- Adjustable Version with Low Threshold Voltage: 0.405 V (min)
- High Threshold Voltage Accuracy: 0.31% typ
- Support for Manual Reset Input (MR)
- Programmable Delay Time: Adjustable via CT pin
Applications
The NCP308MT300TBG is suitable for a wide range of applications where voltage monitoring and reset functionality are critical. These include:
- Microprocessor and microcontroller systems
- Medical devices, such as ventilators and other life-support systems
- Industrial control systems
- Automotive electronics
- Consumer electronics requiring robust voltage supervision
Q & A
- What is the supply voltage range of the NCP308MT300TBG?
The supply voltage range is from 1.6 V to 5.5 V. - What is the quiescent current of the NCP308MT300TBG?
The quiescent current is very low, typically 1.6 μA. - What are the available threshold voltage options for the NCP308 series?
The NCP308 series offers fixed threshold voltage versions for standard voltage rails and an adjustable version starting from 0.405 V. - How can the reset delay time be set for the NCP308MT300TBG?
The reset delay time can be set using the CT pin, with options including fixed times (20 ms or 300 ms) or a user-defined time using a capacitor. - Does the NCP308MT300TBG support manual reset?
Yes, it supports manual reset through the MR input. - What is the threshold voltage accuracy of the NCP308MT300TBG?
The threshold voltage accuracy is typically 0.31%. - What package options are available for the NCP308MT300TBG?
The device is available in WDFN6 (MT) and TSOP-6 (SN) packages. - How does the NCP308MT300TBG handle short negative transients on the SENSE pin?
The device is relatively immune to short negative transients on the SENSE pin, with sensitivity dependent on threshold overdrive. - What is the propagation delay from the MR input to the RESET output?
The propagation delay from MR to RESET is typically 150 ns. - What is the propagation delay from the SENSE input to the RESET output?
The propagation delay from SENSE to RESET is typically 20 μs.
